javascript吧 关注：269,178贴子：906,417
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<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script>
function clew(){
if (document.all.webform.txt.value=="")
{
alert("没有插入信息! ")
}
}
</script>
</HEAD>
<BODY>
<form name="webform" method="post" action="#">
<input type="text" name="txt" />
<input type="button" value="提交" onclick="clew()" />
</form>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script>
function clew(){
if (document.all.webform.txt.value=="")
{
alert("没有插入信息! ")
}
}
</script>
</HEAD>
<BODY>
<form name="webform" method="post" action="#">
<input type="text" name="txt" />
<input type="button" value="提交" onclick="clew()" />
</form>
</BODY>
</HTML>
